FIELD: engines and pumps.
SUBSTANCE: proposed system uses catalyst arranged in engine exhaust channel to cause reaction of NOX contained in offgas and reformed hydrocarbon. Besides, catalyst base on noble metals is applied on offgas cleaning catalyst surface in contact with offgas flow. Note here that basic offgas flow surface is formed around catalyst based on noble metals. Offgas cleaning catalyst can reduce NOX contained in exhaust gas in initiating vibrations of offgas hydrocarbon concentration in preset amplitude range and preset period range. Besides, offgas cleaning catalyst increases amount of NOx contained in exhaust gas on increasing period of vibrations of hydrocarbon concentration beyond preset range. Note here that in engine operation, conversation of hydrocarbons in offgas cleaning catalyst is forced to vary in said preset amplitude range and preset period range to reduce NOx in offgas cleaning catalyst.
EFFECT: higher rate of NOx cleaning.
24 cl, 36 dwg
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